really, for a cheap build, i still think... grab a running 383

have the heads trimmed a bit at a machine shop, say .010 - .020 or so. nice and flat, probably drop the cc's by 3 or 4. put new valve seals on while you are in there, that way they can check the springs, make sure none of them are flat. a good new head gasket. if budget allows, a .500 or so cam. fresh up the carb. let her rip.

if you have a friendly relationship with the machine shop for the head cleanup you are golden.

i dont think you can go to a solid cam that will cost you because of the rockers. but it doesnt sound like you need solids, you will probably be under 6k rpm most of the time.